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Xu Ning, Yongfeng Liang, Chenyang Zhang, Zhen Wang, Yanli Wang, Feng Ye, and Junpin Lin, Development of strong Goss texture in ultra-thin high silicon steel with excellent magnetic properties fabricated by two-stage rolling, Int. J. Miner. Metall. Mater., (2025). https://doi.org/10.1007/s12613-024-2988-3
Xu Ning, Yongfeng Liang, Chenyang Zhang, Zhen Wang, Yanli Wang, Feng Ye, and Junpin Lin, Development of strong Goss texture in ultra-thin high silicon steel with excellent magnetic properties fabricated by two-stage rolling, Int. J. Miner. Metall. Mater., (2025). https://doi.org/10.1007/s12613-024-2988-3
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基于二次轧制工艺的超薄高硅钢强Goss织构演变与磁性能优化

摘要: 新能源汽车驱动电机用无取向硅钢需兼具高磁感应强度、低铁损以及超薄化特性,但传统大压下率轧制易导致不利织构含量增加,显著恶化磁性能。本研究针对超薄无取向硅钢中<001>择优取向(最易磁化方向)调控难题,开发了二次轧制工艺调控Goss织构(110<001>),并用准原位电子背散射衍射(EBSD)技术,系统揭示了0.2 mm高硅钢超薄板在形变-再结晶过程中的织构遗传机制与动态演变规律。研究结果表明,在初次轧制阶段,适当的轧制压下率与中间退火协同作用,可有效抑制111<112>、111<110>等不利织构的发展。二次轧制中,111<112>变形晶粒内部剪切带形成具有Goss取向的亚结构,为再结晶提供优势形核位点。再结晶初期,具有高储存能的111<112>和近111<112>大变形晶粒促进剪切带内Goss及近Goss晶粒的形核与长大,再结晶后期,低储存能的大变形晶粒通过应变诱导晶界迁移机制形核。再结晶过程中Goss以及近Goss晶粒聚集成团,在长大过程中Goss晶粒逐渐偏离其准确取向,转向近Goss取向。二次轧制工艺得到的0.2 mm无取向高硅超薄板呈现优异的磁性能:磁感应强度B50达到1.75 T,中频铁损P10/400低至8.18 W/kg,均优于同厚度商用产品。由此总结得出无取向硅钢经合适的二次轧制工艺参数,Goss织构可以稳定组织继承,这为发展新一代高性能超薄无取向硅钢提供了重要的工艺调控策略与理论支撑。

 

Development of strong Goss texture in ultra-thin high silicon steel with excellent magnetic properties fabricated by two-stage rolling

Abstract: The <001> orientation of the Goss texture aligned with the rolling direction is the most easily magnetized direction, effectively enhancing the magnetic properties of non-oriented silicon steel. In the present study, an ultra-thin high-silicon sheet of 0.2 mm with a strong Goss texture was successfully fabricated using a two-stage rolling method, achieving superior magnetic properties. The combination of suitable primary rolling reduction and intermediate annealing proved beneficial in promoting the formation of Goss texture. Electron back scatter diffraction (EBSD) was used to characterize micro-shear bands within deformed grains of secondary rolled sheets. Observations revealed that the recrystallized Goss nucleus originated from the Goss substructure of shear bands within deformed 111<112> grains during the initial stages of recrystallization. The influence of stored energy and grain size on texture evolution was thoroughly investigated using quasi-in situ EBSD during recrystallization. In the initial stages, large deformed 111<112> and near 111<112> grains with high stored energy facilitated nucleation and growth of Goss and near-Goss grains within shear bands and reduced grain boundary nucleation. In the later stages, large deformed grains with low stored energy underwent a strain-induced grain boundary migration mechanism to nucleate. During the recrystallization, many recrystallized Goss and near-Goss grains clustered together, with Goss grains rotating towards near-Goss orientation. The resulting annealed ultra-thin 0.2 mm sheet with a pronounced Goss texture exhibited superior magnetic properties.

 

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